Fix mismatched type tag clang warning.

Parcel is a struct, not a class. However, Parcel isn't used in this
file, so just kill it.

Change-Id: I575cae8b3c5dd13dd9b03fccfe7423e1f17f62f5
diff --git a/media/libstagefright/httplive/LiveSession.h b/media/libstagefright/httplive/LiveSession.h
index dfb5e59..2d3a25a 100644
--- a/media/libstagefright/httplive/LiveSession.h
+++ b/media/libstagefright/httplive/LiveSession.h
@@ -33,7 +33,6 @@
 struct LiveDataSource;
 struct M3UParser;
 struct PlaylistFetcher;
-struct Parcel;
 
 struct LiveSession : public AHandler {
     enum Flags {